function room1()
    local move = io.read()
    if move == "sourth" then
        return room3()
    elseif move == "east" then
        return room2()
    else
        print("invalid move")
        return room1()
     end
  end

  function room2()
    local move = io.read()
    if move == "sourth" then
        return room4()
    elseif move == "west" then
        return room1()
    else
        print("invalid move")
        return room2()
     end
  end
  function room3()
    local move = io.read()
    if move == "north" then
        return room1()
    elseif move == "east" then
        return room4()
    else
        print("invalid move")
        return room3()
     end
  end
  function room4()
      print("congratilations")
  end

room1()
